P. 205, lines -7 and -9

Line -9 should be:

$\xi (t)=c_{1}\xi ^{1}e^{\lambda _{1}t}+\cdots +c_{n}\xi ^{n}e^{\lambda _{n}t}$

and line -7 should be

$\xi (t)=c_{1}\xi ^{1}+\cdots +c_{n}\xi ^{n}$

Return to errata.